In fact, since the French Revolution, the subject has so frequently been a matter of convention[137] as to establish the general principles, that in case of no special restrictions, river navigation is free, subject to such regulations as the state having jurisdiction may deem necessary, and that the privilege of navigation carries with it the use of the river banks, so far as is necessary for purpose of navigation.[138]
[§ 52. Enclosed Waters]
(a) The rule in regard to waters wholly within the territory of a state such as lakes, etc., is that the jurisdiction is exclusively in that state.
(b) Gulfs, bays, and estuaries are regarded as within the jurisdiction of the state or states enclosing them, provided the mouth is not more than six miles in width. A line drawn from headland to headland on either side of the mouth is considered as the coast line of the state, and for purposes of maritime jurisdiction the marine league is measured from this line. Waters having wider openings into the sea have been claimed on special grounds, as the claim of the United States to territorial jurisdiction over the Chesapeake and Delaware bays. France and Germany claim jurisdiction over gulfs having outlets not over ten miles in width. Between states parties to treaties special claims have been made and allowed. These treaty stipulations do not necessarily bind states not parties to the treaty, e.g. treaty between Great Britain and France, 1839. "It is agreed that the distance of three miles, fixed as the general limit of the exclusive right of fishing upon the coasts of the two countries, shall, with respect to bays, the mouths of which do not exceed ten miles in width, be measured from a straight line drawn from headland to headland."[139]
The present tendency is toward a restricted jurisdiction and the acceptance of the six-mile limit of width of mouth, though there is a reasonable claim that some ratio should be fixed for very large interior water areas to which the entrance, though more than six miles, is yet relatively narrow.
(c) Straits less than six miles in width are within the jurisdiction of the shore state or states. In case two shores are territory of different states, each state has jurisdiction to the middle of the navigable channel.
Where a state owns both shores of a strait which does not exceed six miles in width, the strait is within its territorial jurisdiction, though other states have the right of navigation. This right of navigation is in general conferred upon both merchant and war vessels of states at peace with the territorial power. These vessels must, however, comply with proper regulations in regard to navigation. The claim to exclusive jurisdiction over such narrow straits has been abandoned.
The claim of the king of Denmark to jurisdiction over the Danish Sound and the Two Belts, which entitled him to levy tolls upon vessels passing through, was based on prescription and fortified by treaties as early as the one with the Hanse towns in 1368. Against these tolls, as an unjust burden upon commerce, the United States protested in 1848, at the same time maintaining that Denmark had not the right of exclusive jurisdiction. The European states in 1855 paid a lump sum in capitalization of the sound dues. The United States, refusing to recognize the right of Denmark to levy tolls, paid $393,011 in 1857 in consideration of Denmark's agreement to keep up lighthouses, etc.
The navigation of the Bosphorus and Dardanelles has been a subject of discussion and treaty since 1774, when Russia compelled Turkey to open these straits to the passage of merchant vessels. War vessels were excluded till 1856 when, by convention attached to the Treaty of Paris, such vessels were admitted for special purposes of service to the embassies at Constantinople and protection of improvements on the Danube waterway. By the Treaty of 1871 the Sultan may admit other war vessels, if necessary for carrying out terms of the Treaty of Paris. The United States has never acknowledged that the Sultan had the right to exclude its war vessels, though always asking permission of the Sultan to pass the Dardanelles.
As a generally accepted principle the law may be stated as follows: straits connecting free seas are open to the navigation of all states, subject of course to reasonable jurisdiction of the territorial power.