The Entryway Slope is stretch of sandy sea floor that is named so for its definitive incline. Surrounded by short rock walls on either side, this wide lane just east of Knives Reef isn't populated by very many kinds of fish, though zoom-mode glows in the Slope are home to Spotted Garden Eels and Black Garden Eels, and at night a solitary Manta Ray patrols the lane, as well as a Whale Shark that swims about nearby in a large circular pattern. The most notable sea life here, however, must be the pod of Pacific White-Sided Dolphins that swim about in the area.
There seems to be nothing topographical, geological, or geographical of note here besides the rock formations closing the Hallway in. Located in Western Manoa Lai, between co-ordinates E-4 and E-5, the Entryway Slope is known as the Sloping Hallway in the European release of Endless Ocean. It is unknown what the "entryway" part of this area's North American name is referring to, though perhaps the fact that the Slope leads to an almost room-like rock structure, albeit without a ceiling, could be what earned it that moniker.