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In one of the episodes she's talking about how in the Swamp there's a ton of mud, trees, rock, basically a ton of earth. She also talks about how the trees in the swamps have roots that spread all over the earth. She can literally see cities and people using her Earth-Bending.

From Season 4 Episode 3 "The Coronation" as Korra is training with Beifong, she actually asks that exact question"

Korra asks:

So, what made you wanna drop out and disconnect from the rest of the world?

Toph Replies:

I'm more connected to the world than you've ever been! The roots and vines...they run all over the world! I can see Su and Lin, Zao Fu, and Republic City....I see EVERYTHING. Korra tries to attack from behind You're blind compared to me!

She's in The Swamp because it's where she can use her Earth-Bending to her maximum and also see everything at the same time.

In one of the episodes she's talking about how in the Swamp there's a ton of mud, trees, rock, basically a ton of earth. She also talks about how the trees in the swamps have roots that spread all over the earth. She can literally see cities and people using her Earth-Bending.

She's in The Swamp because it's where she can use her Earth-Bending to her maximum and also see everything at the same time.

In one of the episodes she's talking about how in the Swamp there's a ton of mud, trees, rock, basically a ton of earth. She also talks about how the trees in the swamps have roots that spread all over the earth. She can literally see cities and people using her Earth-Bending.

From Season 4 Episode 3 "The Coronation" as Korra is training with Beifong, she actually asks that exact question"

Korra asks:

So, what made you wanna drop out and disconnect from the rest of the world?

Toph Replies:

I'm more connected to the world than you've ever been! The roots and vines...they run all over the world! I can see Su and Lin, Zao Fu, and Republic City....I see EVERYTHING. Korra tries to attack from behind You're blind compared to me!

She's in The Swamp because it's where she can use her Earth-Bending to her maximum and also see everything at the same time.

1
source | link

In one of the episodes she's talking about how in the Swamp there's a ton of mud, trees, rock, basically a ton of earth. She also talks about how the trees in the swamps have roots that spread all over the earth. She can literally see cities and people using her Earth-Bending.

She's in The Swamp because it's where she can use her Earth-Bending to her maximum and also see everything at the same time.