This is actually a joint term used by both the Japanese and Americans. It is the area of water bounded by Savo Island, Florida Island, and Guadalcanal. Prior to the battle which were fought in the area it was called, Sealark Sound.

Starting on August 8, 1942 and running through November 30 1942, 4 major surface engagements were fought in this area. 14 ships of the IJN were sunk, including two battleships. The allies came out on the short end of the stick loosing 32 warships as well as other transports. Not only this but, there are also countless aircraft on the bottom as well as the bow of the USS Minneapolis.

The battle which were fought in this area were some of the fiercest fought during the war. The battles all centered on keeping the Island of Guadalcanal. The US Marines had landed on August 7, 1942. The Japanese force was unwilling to give up the strategic island. Japan still had hopes for taking Port Moresby on New Guinea.

In May of 1942 Japan had occupied Tulagi and shortly after that started to build and airfield on Guadalcanal. The battles which took place after the American invasion were part of a larger series of engagements, The Battles of the Eastern Solomons.

The map is from Wikipedia