Maridia's Rocky Zone
From Metroid Wiki
Maridia's Rocky zone is a section of Maridia full of watery and rocky parts,
is one of the sections of Maridia is the least extensive,
can only be accessed using a Power Bomb on the Norfair and Maridia connecting glass tube,
You cannot advance in this area if you do not have the Gravity Suit and the Grapple Beam.