N.Y. State Law § 2
The boundary line between the states of New York and Connecticut is as follows:
Commencing at a granite monument (No. 1), at the northwest corner of the state of Connecticut, marking the corner of Massachusetts, New York and Connecticut, in latitude 42º 02' 58" .427 and longitude 73º 29' 15" .959; thence south 2º 42' 30" west 30,569 feet to a granite monument (No. 12) 470 feet south of the Bird Hill road between Millerton and Ore Hill in latitude 41º 57' 56" .772 and longitude 73º 29' 35" .078; thence south 3º 53' 44" west 15,846 feet to a monument (No. 18) in the south side of the highway from Millerton to Sharon along the north shore of Indian Pond in latitude 41º 55' 20" .586 and longitude 73º 29' 49" .318; thence south 2º 47' 51" west 10,681 feet to a monument (No. 21) on the Cliff North of Webatuck creek in latitude 41º 53' 35" .190 and longitude 73º 29' 56" .210; thence south 4º 39' 01" west 10,683 feet to a monument (No. 24) in the rear of R. E. Randall's house on the east road from Sharon Valley to Leedsville in latitude 41º 51' 49" .995 and longitude 73º 30' 07" .652; thence south 3º 49' 10" west 26,405 feet to a monument (No. 32) on the westerly slope of a rocky hillside at the corner of the towns of Sharon and Kent in latitude 41º 47' 29" .709 and longitude 73º 30' 30" .871; thence south 3º 52' 35" west 10,457 feet to a monument (No. 35) on the shoulder of a mountain northeast of Bog Hollow, in latitude 41º 45' 46" .637 and longitude 73º 30' 40" .199; thence south 3º 06' 18" west 16,045 feet to a monument (No. 41) at the easterly edge of a large pasture north of Preston mountain, known as the Chapel lots, in latitude 41º 43' 08" .354 and longitude 73º 30' 51" .658; thence south 3º 57' 03" west 10,657 feet to a monument (No. 45) at the southerly end of Schaghticoke mountain in latitude 41º 41' 23" .320 and longitude 73º 31' 01" .335; thence south 2º 41' 41" west 10,534 feet to a monument (No. 48) on the northwesterly slope of Ten-Mile hill in latitude 41º 39' 39" .359 and longitude 73º 31' 07" .860; thence south 3º 31' 33" west 21,140 feet to a monument (No. 55) at the northerly end of a rocky hill about a mile south of the northeast corner of the town of Pawling, New York, in latitude 41º 36' 10" .894 and longitude 73º 31' 24" .972; thence south 4º 24' 52" west 10,785 feet to a monument (No. 59) in a field east of a right angle in the road from Quaker Hill to Sherman in latitude 41º 34' 24" .659 and longitude 73º 31' 35" .893; thence south 3º 52' 52" west 10,520 feet to a monument (No. 64) on a ledge falling southwest to a brook in the southwestern part of the town of Sherman in latitude 41º 32' 40" .963 and longitude 73º 31' 45" .257; thence south 4º 28' 48" west 10,410 feet to a monument (No. 68) on Cranberry mountain in latitude 41º 30' 58" .424 and longitude 73º 31' 55" .946; thence south 2º 24' 38" west 10,617 feet to a monument (No. 72) on the northerly slope of a hill a mile south of Haviland Hollow in latitude 41º 29' 13" .627 and longitude 73º 32' 01" .813; thence south 3º 03' 12" west 20,731 feet to a monument (No. 80) in a mowed field southeast of an angle in the road from Brewster to Ball pond in latitude 41º 25' 49" .108 and longitude 73º 32' 16" .309; thence south 4º 53' 12" west 10,279 feet to a monument (No. 84) on the northerly side of a rocky summit northwest of Mill Plain in latitude 41º 24' 07" .915 and longitude 73º 32' 27" .798; thence south 2º 45' 48" west 10,527 feet to a monument (No. 89) in a swampy pasture south of a right angle in a back road which runs along the line between the towns of Danbury and Ridgefield in latitude 41º 22' 24" .030 and longitude 73º 32' 34" .456; thence south 4º 36' 39" west 10,878 feet to a monument (No. 91) in a swamp near Mopus brook in latitude 41º 20' 36" .900 and longitude 73º 32' 45" .920; thence south 4º 12' 16" west 10,493 feet to a monument (No. 96) south of a ledge on Titicus mountain in latitude 41º 18' 53" .507 and longitude 73º 32' 56" .001; thence south 6º 32' 21" west 7,214 feet to a monument (No. 98) known as the Ridgefield angle on a steep side hill sloping toward south pond in latitude 41º 17' 42" .690 and longitude 73º 33' 06" .764; thence south 32º 46' 06" east 14,109 feet to a monument (No. 103) in a swamp near a small brook in latitude 41º 15' 45" .460 and longitude 73º 31' 26" .775; thence south 32º 41' 46" east 10,443 feet to a monument (No. 106) at the westerly side of a rocky ridge near the southwest corner of Ridgefield in latitude 41º 14' 18" .626 and longitude 73º 30' 12" .940; thence south 32º 02' 28" east 11,047 feet to a monument (No. 109) known as the Wilton angle in woodland northwest of Bald Hill in latitude 41º 12' 46" .101 and longitude 73º 28' 56" .263; thence south 59º 59' 58" west 9,588 feet to a monument (No. 112) on the south side of a short cross road leading west from the Vista road in latitude 41º 11' 58" .721 and longitude 73º 30' 44" .877; thence south 57º 58' 49" west 6,002 feet to a monument (No. 115) on the northeasterly slope of a low, wooded hill one-half mile west of Mud pond and northeast of Sellick's Corners in latitude 41º 11' 27" .272 and longitude 73º 31' 51" .438; thence south 59º 09' 58" west 15,983 feet to a monument (No. 120) on the summit of a rocky ridge half way between two large swamps, northeast of long ridge in latitude 41º 10' 06" .294 and longitude 73º 34' 50" .871; thence south 58º 56' 22" west 21,193 feet to a monument (No. 127) in level woodland west of a low hill west of Banksville in latitude 41º 08' 18" .189 and longitude 73º 38' 48" .129; thence south 58º 32' 47" west 26,355 feet to a rough granite monument (No. 140) known as the Duke's Trees angle, set in concrete with its top below the roadway called King street in latitude 41º 06' 02" .205 and longitude 73º 43' 41" .778; thence south 31º 29' 41" east 11,440 feet to a monument (No. 148) 300 feet north of the road leading west from King street south of Rye lake in latitude 41º 04' 25" .814 and longitude 73º 42' 23" .747; thence south 32º 10' 57" east 14,975 feet to a monument (No. 153) at the east side of King street 1,000 feet north of Ridge street in latitude 41º 02' 20" .570 and longitude 73º 40' 39" .666; thence south 32º 07' 30" east 11,461 feet to a granite monument (No. 158) set at the north side of Byram bridge in a concrete pier on a granite ledge known since 1684 as the Great Stone at the wading place in latitude 41º 00' 44" .662 and longitude 73º 39' 20" .172; thence south 9º 53' 43" west 835 feet to a brass bolt and plate (No. 159) set in the top of a large boulder in Byram river in latitude 41º 00' 36" .535 and longitude 73º 39' 22" .044; thence south 18º 56' 41" west 3,735 feet to angle No. 161 in Byram river in latitude 41º 00' 1" .626 and longitude 73º 39' 37" .863, this tangent being produced and referenced on the shore by a brass bolt and plate leaded into the rock on a steep hill; thence south 12º 57' 02" east 965 feet to angle No. 162 in Byram river in latitude 40º 59' 52" .335 and longitude 73º 39' 35" .044, the line being produced and referenced by a bolt and plate in the rock on a hill east of the river; thence south 5º 14' 08" west 950 feet to angle No. 163 in Byram river in latitude 40º 59' 42" .995 and longitude 73º 39' 36" .173, the line being produced and referenced by a bolt and plate in the ledge on the west shore of the river; thence south 9º 10' 19" east 692 feet to angle No. 164 in Byram river in latitude 40º 59' 36" .249 and longitude 73º 39' 34" .736, the line being produced and referenced by a bolt and plate in the shore; thence south 34º 35' 04" east 684 feet to angle No. 165 in Byram river in latitude 40º 59' 30" .682 and longitude 73º 39' 29" .671, both ends of this and the three subsequent tangents being produced and referenced by brass bolts and plates set in the ledge on the shore of the river; thence south 26º 00' 02" east 229 feet to angle No. 166 in latitude 40º 59' 28" .646 and longitude 73º 39' 28" .360; thence south 5º 26' 38" west 402 feet to angle No. 167 in latitude 40º 59' 24" .694 and longitude 73º 39' 28" .857; thence south 50º 49' 51" west 815 feet to angle No. 168 in latitude 40º 59' 19" .608 and longitude 73º 39' 37" .096; thence south 30º 01' 41" east 1,924 feet to angle No. 169, a point in the center of the channel in line with the breakwater at Lyon's or Byram point in latitude 40º 59' 03" .152 and longitude 73º 39' 24" .546, the northerly end of this tangent being produced back and referenced by a brass bolt and plate in the ledge overlooking the harbor; thence south 45º east 17,160 feet or three and one-quarter miles to angle No. 170 in latitude 40º 57' 03" .228 and longitude 73º 36' 46" .418, the first angle point in Long Island sound described by the joint commissioners of New York and Connecticut by a memorandum of agreement dated December eighth, eighteen hundred and seventy-nine; thence in a straight line (the arc of a great circle) north 74º 32' 32" east 434,394 feet to a point (No. 171) in latitude 41º 15' 31" .321 and longitude 72º 05' 24" .685, four statute miles true south of New London lighthouse; thence north 58º 58' 43" east 22,604 feet to a point (No. 172) in latitude 41º 17' 26" .341 and longitude 72º 01' 10" .937, marked on the United States coast survey chart of Fisher's Island sound annexed to said memorandum,-- which point is on the Long east 3/4 north sailing course drawn on said map 1,000 feet true north from the Hammock or North Dumpling lighthouse; thence following said east 3/4 north sailing course north 73º 37' 42" east 25,717 feet to a point (No. 173) in latitude 41º 18' 37" .835 and longitude 71º 55' 47" .626, marked No. 2 on said map; thence south 70º 07' 26" east 6,424 feet toward a point marked No. 3 on said map until said line intersects the westerly boundary of Rhode Island at a point (No. 174) in latitude 41º 18' 16" .249 and longitude 71º 54' 28" .477 as determined by the joint commissioners of Connecticut and Rhode Island by a memorandum of agreement dated March twenty-fifth, eighteen hundred and eighty-seven.
The geodetic positions given in this description are based on Clark's spheroid of eighteen hundred and sixty-six and the astronomical data adopted by the United States coast and geodetic survey in eighteen hundred and eighty and are computed from data given in appendix number eight to the report of the said survey for eighteen hundred and eighty-eight, entitled "Geographical Positions in the State of Connecticut."
The boundary line hereinbefore described and determined which has been located and defined as, and in the manner, provided by section eight of this chapter is fully and accurately laid down on duplicate maps, one copy of which has been deposited with the secretary of state of the state of New York and the other copy thereof with the secretary of state of the state of Connecticut.
Nothing herein contained shall be construed to affect any existing titles to property, corporeal or incorporeal, held under grants heretofore made by either of said states, nor to affect existing rights which said states or either of them or which the citizens of either of said states may have by grant, letters-patent or prescription of fishing in the waters of said sound, whether for shell or floating fish irrespective of the boundary line hereby established, it not being the purpose hereof to define, limit or interfere with any such right, rights or privileges whatever the same may be.
The governor is authorized and requested to transmit a copy of this act to the governor of the state of Connecticut, and upon receiving acknowledgment of its receipt by the state of Connecticut the governor of this state shall cause such acknowledgment to be filed in the office of the secretary of state.
The governor of this state is authorized in concurrence with the governor of the state of Connecticut to communicate to congress the action of the two states on this subject and to request the approval of congress of the boundaries thus established and monumented.
N.Y. State § 2