Spring of the Spirit Lanayru

Lanayru Spring is a location in. As its name suggests, it serves as the home of the Light Spirit Lanayru and is situated in Lake Hylia. This spring is popular for Hylian citizens since it is here where they can send prayers to the Spirit of Light.

Overview
When Link first walks into the Lanayru Spring as a wolf, the Light Spirit Lanayru will ask that the young hero defeat the Shadow Insects and retrieve the Tears of Light from them in order to return light to the province. Doing so will restore Lanayru's powers, who will tell Link that the next Fused Shadow rests in the Lakebed Temple. Before Link departs, however, Lanayru informs the young hero about the true power of the Fused Shadow and will also speak to him about the Sacred Realm, the Triforce, and the Interloper War caused by the Twili.

Upon completing the Lakebed Temple, Link is warped to the Lanayru Spring and is immediately confronted by Zant. Although Lanayru tries to stop Zant, the Twili easily bests the Light Spirit, causing the spring to be covered in Twilight yet again and thus transforming Link into a wolf. Zant tries to persuade Midna to join his side, but after she refuses, he holds her up in front of Lanayru, who gravely injures Midna with its light. Immediately after this, Link and Midna are warped out of the spring and into Hyrule Field.

In the Cave of Ordeals, when Link reaches the 40th floor, the Great Fairy will reward the young hero by releasing recovery fairies into the Lanayru Spring Spring. Reaching the last floor of the cave will allow Link to talk to the Great Fairy at the spring and receive unlimited Great Fairy's Tears, provided that he doesn't already have a bottle full of them.

Link can also obtain a Piece of Heart by using the Clawshot to climb the vines on the east side and thus be able to reach a door that houses the prize behind it.