Channels of the Hawaiian Islands
In an archipelago like the Hawaiian Islands the water between islands is typically called a channel or passage. Described here are the channels between the islands of Hawaiʻi, arranged from southeast to northwest.
ʻAlenuihāhā Channel 
The ʻAlenuihāhā separates the island of Hawaiʻi and the island of Maui. The maximum depth of this channel is 6100 feet (1900 m), and the channel is 30 miles wide. There is a significant wind funnel effect in the channel, which is subject to scientific investigations.
ʻAlalākeiki Channel 
Kealaikahiki Channel 
Ke ala i kahiki channel is the channel between Lānaʻi and Kahoʻolawe. It literally means "the road to Tahiti"; if one takes a bearing off of Kealaikahiki Point on Kahoʻolawe while in the channel and heads directly straight, one arrives, more or less, in Tahiti. In practice, however, Polynesian navigators probably did not quite ply a straight route to Tahiti. The channel is 17 miles wide.
ʻAuʻau Channel 
The ʻAuʻau Channel is one of the most protected areas of ocean in the Hawaiian Islands, lying between Lānaʻi and Maui. The channel is also protected by Molokaʻi to the north, and Kahoʻolawe to the south. The depth of the channel reaches 108 feet (33 m), and its width is 8.8 miles. ʻAuʻau channel is a whale-watching center in the Hawaiian Islands. Humpback whales migrate approximately 3,500 miles (5600 km) from Alaskan waters each autumn and spend the northern hemisphere winter months in the protected waters of the channel.
ʻAuʻau translates to "to take a bath" referring to its calm bath-like conditions.
Lahaina Roads 
The middle of the ʻAuʻau channel off Lahaina is known as the Lahaina Roads. Once filled with whalers when Lahaina was a capital for that industry, Lahaina Roads were later adopted as an alternate anchorage for the main U.S. Pacific Fleet based at Pearl Harbor. In the planning for the attack on Pearl Harbor, the Japanese had hoped that the Pacific Fleet still utilized Lahaina as an anchorage as ships sunk in the deep water there would have been unrecoverable. However, Lahaina was not utilized, and the bulk of the fleet remained moored in Pearl Harbor. The Roads are still a common moorage for oceangoing cruise ships and naval vessels of many flags, including the U.S., whose crews enjoy liberty on the mainland.
Pailolo Channel 
The Pailolo Channel separates the islands of Molokaʻi and Maui. Although the channel is only about 8.4 miles at its shortest point, it is one of the windiest and roughest in the Hawaiian Islands.
Pailolo translates to "crazy fisherman" referring to the typical sea surface conditions and who would attempt to navigate therein.
Kalohi Channel 
The Kalohi Channel is the stretch of water separating Lānaʻi and Molokaʻi. Depth of water in this channel is about 260 feet (79 m) and width is 9.3 miles. This is one of the less treacherous channels between islands in the archipelago, although strong winds and choppy sea conditions are frequent. Kalolohia beach on the Lānaʻi coast is also known as "Shipwreck Beach" because of a wreck on the reef there.
Kaiwi Channel 
The Kaiwi Channel (also known as the Molokaʻi Channel) separates the islands of Oʻahu and Molokaʻi, and is 26 miles wide. Maximum depth is 2300 feet (701 m). There are annual paddleboarding and outrigger canoe paddling contests which traverse this channel.