Source: The Great Interpretation of Dreams (Ibn Sirin)
A swamp in a dream indicates a woman of bad character or strife. Falling into it indicates falling into worry and hardship.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A swamp indicates a lowly man. Getting out of it is salvation from evil.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A swamp is interpreted as worry. Whoever sees himself falling into it will be afflicted with worry.