The Ontong Java Plateau is a huge undersea plateau located in the Pacific Ocean, lying north of the Solomon Islands. The plateau covers an area of approximately 2,000,000 km², or roughly the size of Alaska, and reaches a thickness of up to 30 km. The plateau is of volcanic origin, composed mostly of flood basalts, and is the world's largest large igneous province. The plateau was formed under the Pacific, and most of the plateau still lies under the sea, although the collision of the Solomon Islands with the plateau has lifted some of the plateau above sea level on the islands of Santa Isabel, Makira, and Malaita. Ontong Java Atoll is located in northern Malaita Province. Some of the rocks that make up the plateau have been dated to 120 million years ago (mya), and others to 90 mya. This article or section does not cite its references or sources. ... This article is about volcanoes in geology. ... A flood basalt is a giant volcanic eruption that coats large stretches of land with basalt lava. ... A large igneous province (LIP) is an extensive region of basalts resulting from flood basalt volcanism. ... Solomon Islands map, highlighting Santa Isabel Santa Isabel, neighbouring islands, and towns and villages Santa Isabel Island is the longest in the Solomon Islands, South Pacific, and the largest in Isabel Province. ... The Island of Makira (formerly San Cristobal) in the Solomon Islands is the largest island of Makira/Ulawa Province. ... Malaita Province is one of the largest provinces of the Solomon Islands. ... Ontong Java Atoll is the northernmost tract of land in the Solomon Islands and an outlying part of the province of Malaita. ...