ExpeditionA journey undertaken for a specific purpose
Definitions:
A journey or voyage undertaken by a group of people with a particular purpose, especially that of exploration, scientific research, or war.
SurvivalThe state or process of continuing to live or exist, typically in spite of difficult conditions
Definitions:
The state or fact of continuing to live or exist, typically in spite of an accident, ordeal, or difficult circumstances.
PerilousFull of danger or risk
Definitions:
Exposed to imminent risk of disaster or ruin.
AdversityA difficult or unpleasant situation
Definitions:
A state or instance of serious or continued difficulty or misfortune.
TributaryA river or stream flowing into a larger river or lake
Definitions:
A stream or river which flows into a larger one.