evidence: The PRC, Taiwan, and Vietnam each claim sovereignty over the Paracel Islands. In violation of international law, all three claimants require either permission or advance notification before a military vessel or warship engages in "innocent passage" through the territorial sea. Under customary international law as reflected in the Law of the Sea Convention, the ships of all States – including their warships – enjoy the right of innocent pass through the territorial sea. The unilateral imposition of any authorization or advance-notification requirement for innocent passage is unlawful. By engaging in innocent passage without giving prior notification to or asking permission from any of the claimants, the United States challenged these unlawful restrictions imposed by the PRC, Taiwan, and Vietnam. The United States demonstrated that innocent passage is not subject to such restrictions. The United States also challenged the PRC’s 1996 declaration of straight baselines encompassing the Paracel Islands. Regardless of which claimant has sovereignty over these islands, it is unlawful to draw straight baselines around the Paracel Islands in their entirety. Customary international law as reflected in the Law of the Sea Convention is both clear and comprehensive regarding the circumstances under which States can depart from "normal" baselines. The PRC-claimed straight baselines violate customary international law reflected in Article 7 of the Law of the Sea Convention. Furthermore, international law does not permit continental State, like the PRC, to establish baselines around entire dispersed island groups. With these baselines, the PRC has attempted to claim more internal waters, territorial sea, exclusive economic zone, and continental shelf than it is entitled to under international law.