*Environmental Context:*

1. Polluted or contaminated water with high levels of pollutants, sediment, or algae.
2. Water with high levels of dissolved organic carbon, giving it a dark color.

*Literary Context:*

1. "Black Water" is a novel by Joyce Carol Oates (1992), exploring themes of politics, power, and morality.
2. "Black Water" is also a short story by H.P. Lovecraft (1927), a classic horror tale.

*Film and Television:*

1. "Black Water" (2007), an Australian horror film about a saltwater crocodile attack.
2. "Black Water" (2018), an action-thriller film starring Jean-Claude Van Damme.

*Idiomatic Expression:*

1. "In deep black water" means being in a difficult or uncertain situation.

*Other Meanings:*

1. Blackwater: a private military company (2007-2010), known for its involvement in Iraq and Afghanistan.
2. Black water diving: exploring underwater caves or shipwrecks with limited visibility.