Zora's Domain is located in eastern Hyrule, behind the Sleepless Waterfall at the source of Zora's River. The Zora who dwell there are a secluded race, and so only those who know "Zelda's Lullaby"--generally only taught to members of the Royal Family of Hyrule--are allowed to pass through the waterfall and into Zora's Domain. Interestingly, the Domain can also be entered through an underwater tunnel from Lake Hylia.
Zora's Domain is ruled by King Zora XVI, and does not contain much aside from King Zora's Chamber, the High Dive Practice Spot and a small shop. From Zora's Domain, Link can enter Zora's Fountain. Here, Lord Jabu-Jabu, the Zora's patron deity, resides on his altar.
When Link returns to Zora's Domain after his seven-year slumber in the Sacred Realm, he finds the entire Domain encased in ice. He makes his way to the frozen Zora's Fountain, enters the Ice Cavern and successfully obtains the Iron Boots hidden there. However, even after he traverses the Water Temple and defeats Morpha, Zora's Domain remains frozen, although according to Princess Ruto the Domain will return to its original state in time. This is evidenced during the game's end credits, in which Zora's Domain is fully thawed and its Zora residents are celebrating at Lon Lon Rance with the rest of Hyrule.
A square hole can be seen in the bedrock underneath the water in Zora's Domain, near the entrance. Many players assume that this hole is an unremoved beta element that would have been the entrance to another dungeon, often speculated to be the Unicorn Fountain. It is possible to get underneath the ice of Zora's Domain as an adult using a glitch. Upon reaching the square hole using the Iron Boots, however, it is revealed to be completely blocked off.
Zora's Domain is located north of Hyrule Castle Town and Lake Hylia, in the Lanayru Province. Again, it is the home of the Zora race. It is the only location where the sacred Reekfish can be caught. Many Zoras reside here, including Prince Ralis once he returns from Kakariko Village, who seats himself on his mother's throne.
Zora's Domain consists of a throne room atop a large waterfall and pool. Initially frozen by Zant, it is thawed when Link and Midna warp a burning-hot lava rock from Death Mountain into the throne room. Zora's River is located to the south, and the westward entrance to Snowpeak Ruins becomes accessible once the Domain is unfrozen. The throne room can be reached by asking a Zora at the base of the waterfall to swim Link up. Also, in wolf form, Link can jump up using Midna's multiple-jump technique on the nearby ledges and rocks. Finally, Link can climb the rocks beside the waterfall with his Clawshot. At the bottom of the the pool within the throne room is a Goron trapped inside the volcanic rock Midna warped there. He gives Link a Bomb Bag if he frees the Goron using Water Bombs.
Zora's Domain serves as the location for Zora River Target Practice.