Sea of Trees
For The Legend of Zelda: A Link to the Past & Four Swords on the Game Boy Advance (GBA).
101Leafy researched the game for the maps on these pages. A stage is never the same twice: each visit is put together from the maps on that stage's page. The numbered pins on a map mark where players 1, 2, 3, and 4 start.
From the official guide
Every time you blaze a trail through the Sea of Trees, its woodlands grow more tangled—and its traumas more terrifying. It has so many variations that we can cover only a few examples of what you'll see.
The Sea of Trees contains so many challenges—which change every time you plunge in—that you may wonder if you'll ever emerge from the forest. You'll encounter many obstacles that you won't find in any other stage, such as tree mazes choked with plant life and railways that cut through the wilderness. Only if you work as a team will you have a chance at survival. If you go your separate ways, the forest will devour you.
To whittle the gelatinous creature down to nothing, position one party member on either side of the creature, then bat it back and forth with your swords. If you do so quickly, the creature won't have time to regenerate.
The bizarre foes with ears that protrude far from their bodies have little to fear from a single player's attack. But if each of two players grabs an ear and pulls, the critter will split apart and dump its innards all over the lawn.
Maps
1234Map 1 Enemies: Chuchu
1234Map 2 Enemies: Wizzrobe
1234Map 3 Enemies: Chuchu
12Map 4 
12Map 5 Some settings are complete unto themselves—they don't require that a random part be placed in their midst. The woodland maze is one such monstrosity. No matter how many times you venture into the woodland maze, you'll be disoriented because the starting location changes each time. The warp zone—and its single Heart Container—is always in the northwest corner.
The Legend of Zelda: A Link to the Past & Four Swords, The Official Nintendo Player's Guide (Nintendo of America, 2002), p. 111 
12Map 6 Enemies: Chuchu
1234Map 7 
12Map 8 
1234Map 9 
1234Map 10 
12Map 11 Enemies: Chuchu
1234Map 12 
1234Map 13 
1234Map 14 Enemies: Chuchu
1234Map 15 Enemies: Stalfos
1234Map 16 
1234Map 17 Enemies: Chuchu
1234Map 18 
1234Map 19 Enemies: Chuchu
Enemies
101Leafy researched the game for where these enemies appear. The line under each map names the ones it can call up. Four Swords plays each stage at three levels, and some maps call up other enemies on each. Where they differ, the level is named.
Fairy fountain
The room of the Great Fairy in Sea of Trees.
Boss room
The boss at the end of Sea of Trees. Sea of Trees Boss