Grid Scylla

Grid Scylla is a Predacon designation for an area on Earth during the Beast Wars. The area is mostly grassy plateaus overlooking the sea and neighboring a mountain range.

Beast Wars cartoon
Tarantulas's lair (one of them) was in one of the cliff sides. After the lair blew up, Megatron and the remaining Predacons searched the wreckage and found the entrance hatch to a tunnel that led to the crashed Decepticon warship, the Nemesis.

Note

 * Beast Wars story editors Bob Forward and Larry DiTillio worked various references to the online Transformers fandom into the series. Grid Scylla is a reference to a fan who used the screen name Scylla, which she likely took from the Beast Wars II character of the same name.