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TERRITORIAL SEA BOUNDARY:
CYPRUS--SOVEREIGN BASE AREA (U.K.)
Introduction
When Cyprus became independent in 1960, the United Kingdom retained, as sovereign
British territory, certain base areas on the island. These non-ceded lands did not pass to
the new state. The limits between the base areas and Cyprus were precisely delimited as
international boundaries, and provisions were made for the demarcation on the lines.
In addition, Section 3 of the Treaty Concerning the Establishment of the Republic of Cyprus
provided for territorial sea boundaries between the Republic and the U.K. Sovereign Base
Area (SBA). These limits also may have a potential influence on continental shelf
boundaries although the possibility is not dealt with specifically in the treaty.
Section 3 states:
1. The Republic of Cyprus shall not claim, as part of its territorial sea, waters lying between
Line I and Line II as described in paragraph 2 of this Section, or between Line III and Line
IV as described therein.
2. The lines for the purposes of paragraph 1 of this Section shall be as follows:-
Line I: From the position of the low-water line lying in a 163º direction from Point No. 57
D/1, as defined in Schedule A to this Annex, in a 163º direction for 6.85 miles; then in a
207º direction for 3 miles; and then in a 204º direction.
Line II: From the position on the low-water line lying in a 108-1/2º direction from Point 59
A/5, as defined in Schedule A to this Annex, in a 108-1/2º direction for 7.8 miles; and then
in a 136º direction.
Line III: From the position on the low-water line lying in a 170º direction from Point No. 41
B/10, and defined in Schedule B to this Annex, in a 170º direction for 3.8 miles; then in a
136º direction for 3.1 miles; and then in a 156º direction.
Line IV: From the position on the low-water line lying in a 103º direction from Point No. 42
B/3, as defined in Schedule B to this Annex; in a 103º direction for 0.9 miles; then in a 150º
direction for 6.3 miles; and then in a 176º.
3. In paragraph 2 of this Section, the distances quoted are in sea miles reckoned at 1,582
international metres to one sea mile, and the bearings are referred to the True North and
are given in degrees reckoned clockwise from 000º (North) to 359º.
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The Schedules A and B cited in the Section list the various United Kingdom base sites
mentioned in the agreement. The specified points were plotted on large-scale maps which
were deposited with the treaty but never publicly printed. The U.K. Government, however,
has informed us that the values of the four points are as follows:
57
D/1
59
A/5
41
B/10
42
B/3
48401098
71971008
564009.7 E
3871228.2
582264.6
3869698.3
Cyprus Metric Grid
Cyprus Metric Grid
UTM Grid Coordinates
UTM Grid Coordinates
The four specific lines have been printed on the attached charts and represent the limits
between the territorial waters of the U.K. SBA and the Republic. The former would follow
the United Kingdom claim for territorial waters of 3 nautical miles while Cyprus claims 12.
The distances as measured from the normal baseline have been noted on the map.
Directional alignments of the boundaries change at distances greater than 3 nautical miles
from the baseline. Azimuths do not, however, change beyond 12 nautical miles. In each
instance, the terminal limits in the sea boundaries have not been designated; presumably
they may be continued indefinitely or until the adjacent lines connect. Since the 12-mile
limit from the baseline could have been determined precisely, the non-termination must
have been deliberate. Logically, the decision could be based on: a) the concern that one
party might extend its territorial sea to a distance which would envelop or enclose the sea
of the other; or 2) the anticipated need for the limits to serve as a continental shelf or
seabed boundary beyond the territorial sea.
The 100-fathom line on the chart, which is situated within the 3-mile limit (along the
boundaries), approximates the 200-meter depth limit cited in the Convention on the
Continental Shelf.
ANALYSIS
A precise determination of the principles used by the negotiators is impossible. The limits,
however, are not based on the equidistance principle. Rather they appear to have been
drawn as simplified normals to generalized coastal baselines. As the limit extends
seaward, the coastal area involved in the normalization increases and the line vector must
change. The result is a simplified but effective method of maritime boundary
determination. The principal difficulty, if indeed normalization was the basis, would involve
the determination of the "general direction" and sector of the coastline to be used for the
particular perpendicularity.
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The eastern sector's limits appear to converge at a distance of approximately 32 nautical
miles from the shore. The eastern boundary of the western U.K. SBA will not connect, if
prolonged, with the limits of the eastern SBA zone.
The United Kingdom is party to both the Convention on the Territorial Sea and Contiguous
Zone and to the Convention on the Continental Shelf. Cyprus has adhered to neither.