It is composed of the Hawaiian ridge , consisting of the islands of the Hawaiian chain northwest to Kure Atoll , and the Emperor Seamounts : together they form a vast underwater mountain region of islands and intervening seamounts , atolls , shallows , banks and reefs along a line trending southeast to northwest beneath the northern Pacific Ocean .
The Hawaiian-Emperor seamount chain is the Hawaiian Islands and the Emperor Seamounts : together they form a vast underwater mountain region of islands seamounts , atolls , shallows , banks and reefs .