Zora's Domain

Zora's Domain is a location from The Legend of Zelda: Ocarina of Time and The Legend of Zelda: Twilight Princess.

Zora's Domain in Ocarina of Time
Zora's Domain is the home of the aquatic race of the Zora. The large cavernous area is accessed from Zora's River or from a secret entrance hidden under water in Lake Hylia. The area has a shop where items, such as the water tunic can be purchased. Zora's domain is the home of King Zora and his daughter, Princess Ruto. To enter Zora's Domain, Link will need to play Zelda's Lullaby in front of the seemingly impassable waterfall at the end of the Zora's River trail. When aquiring the Spiritual Stone of Water early on in the game, Link is required to enter Jabu Jabu's belly and rescue Princess Ruto. Zora's domain plays a key part in the game, housing one of the 6 sages Princess Ruto.

This domain is also in 'The Legend of Zelda: A Link to the Past.', where you get the Flippers.

Zora's Domain in Twilight Princess
The domain consists of two main parts: The throne room, and what might possibly be Zora's Fountain, which connects to Snowpeak.It is nessacary to fish here( Between the Mother and Child Rocks) after getting the Coral lure,so that Link can get the Reekfish Scent. There are 3 ways to enter it:

1. Warping 2. Blowing up a rock in Hyrule Field, which block the entrance. 3. Playing Plumm's minigame ( this takes you to upper Zora's River, and from here, you can enter the Domain by swimming.

When Zora's Domain is covered by Twilight, the Zora's are Frozen solid. this time. Link must warp to Death Mountain in order to get the Molten Shard to defrost the Zoras. After you get the Water Bombs and Zora Armor, you can sink to the bottom of the throne room, and blow up the shard, releasing a Goron that was trapped in it. Speak to him, and you will get a Bomb Bag.