Lake Siela is a location found in Breath of the Wild.
Located within the Dueling Peaks Tower region, Lake Siela is a body of water located just south of Kakariko Village. The Kakariko Bridge crosses over the Lake, connecting the Dueling Peaks Stable with Kakariko Village. At the far east end of the Lake, there is a waterfall, with the water originating from beneath the Phalian Highlands. Due to the waterfall, from the lake flows from east to the west. Near the waterfall there is a Raft that Link can ride down the lake towards the Kakariko Bridge.
The Lake is filled with a variety of fish including Hyrule Bass, Mighty Carp, Armored Carp, and Staminoka Bass. The area is also littered with Water Octoroks that are found sporadically across the lake.
There are several treasure chests found in and around the Lake. Just beneath the Kakariko Bridge, there is a treasure chest that contains some Ice Arrows and then a treasure in the water to the east of the bridge that has an Opal gem. At the far east end of the lake, there is a treasure chest underwater that has 10 Arrows. One more treasure chest can be found underwater at the bottom of the waterfall containing a Purple Rupee.
Just north of the Lake, right along the road, Link will find Hestu and when he first talks with him, he can partake in The Priceless Maracas side quest. Hestu's Maracas are found in a treasure chest at a Bokoblin camp just west of the waterfall that spills into Lake Siela.
Nearby Korok Seeds
Toss a boulder into the circle of rocks found in the lake.
Climb to the top of the tree and examine the fairy lights.
Jump into the circle of water lillies. If you don't make it from the ledge, you don't have to climb all the way up to try again, just climb up a little bit and jump directly off the wall (hold down when pressing the jump button).
Uphill to the east are boulders. Roll one into the hole.
Blow up the destructible rocks, then pick up the indestructible one.