mo·rass 
(mə-răs, mô-)
(mə-răs, mô-)n.
1. An area of low-lying, soggy ground.
2. Something that hinders, engulfs, or overwhelms: a morass of details.
[Dutch moeras, from Middle Dutch maras, from Old French mareis, probably of Germanic origin; see mori- in the Appendix of Indo-European roots.]