also: ていしっち
低湿地の植物を観察する。
Observe plants of the marsh.
沼地 refers to a swamp or bog, often with standing water and muddy soil, whereas 低湿地 is a broader term for low-lying wet areas.
Standard kanji spelling.
Alternate reading with geminate consonant. Both readings are used.
Compound of 低 (low) + 湿地 (wetland). The reading ていしっち is a euphonic change from ていしつち.