These are the Channel Islands off the coast of Southern California. They form a little archipelago of 8 islands.
As mentioned earlier, Native American Indians developed watercraft and associated technology relevant to their environment and geography. The North and South American continents have several rivers, lakes, and estuaries, and many of these rivers, lakes, and estuaries are the largest or longest in the world. They developed largely canoes of varying designs, sizes, and materials (dugout, plank, skin, and bark) to navigate these bodies of water, and also reed boats, bull boats, and inflated walrus skin boats. Many were lightweight allowing easy portage especially if one needed to transport it overland briefly from one river to another as an example. They were durable, or easily repaired with local material. Native Americans were known for their paddling prowess and skill, as they can paddle their canoes for long distances and long periods of time, with or against the current, in dangerous rapids, deep or shallow water, and in wetlands and swamps.
Some especially in South America may have used sails although there appears to be some controversy over this. But it is well known that Native Americans can travel (paddling with their canoes) on the ocean to islands several miles from the coast such as the Channels Islands off of Southern California as mentioned earlier, or from Florida to Cuba, or from Northern South America to the Caribbean Islands, or among the many islands off of Chile, or among the Aleutian Islands, etc.
Native Americans especially on the west coast of South America, in particular off the coast of Ecuador and Peru, may have developed the most advanced rafts in the world, as they can travel on the ocean carrying several people and loads, and are thought to have used sails. But they are thought to largely travel along the coast reaching as far as Mexico.
