Maps - Azeroth - Eastern Kingdoms - Vashj'ir - Shimmering Expanse

Abandoned Reef, Underlight Canyon, Korthun's End, Seabrush, Glimmerdeep Gorge, Gurboggle's Ledge, Seafarer's Tomb, The Skeletal Reef, Nespirah, Ruins of Vashj'ir, Silver Tide Hollow, Abyssal Breach, Deepfin Ridge, L'ghorek, The Scalding Chasm, Gnaws' Boneyard, The Clutch, Legion's Fate, Beth'mora Ridge, Ruins of Thelseral Temple, Shimmering Grotto

There is only one exploration achievment list for all three of the Vashj'ir Zones.

This zone has the following: Beth'mora Ridge, Glimmerdeep Gorge, Nespirah, Ruins of Thelseral Temple, Ruins of Vashj'ir, Shimmering Grotto and Silver Tide Hollow.

It appears that Beth'mora Ridge is just that small piece of bridge on the West side of Beil'aran Ridge opposite the Ruiins of Vashj'ir.