1. toward or in the direction of the source of a river; against the current

1. located toward or in the direction of the source of a river

Examples

• The salmon swim upriver to spawn.
• We paddled upriver for three miles.
• The upriver communities depend on fishing.
• Heavy rains caused flooding in upriver areas.
• The boat struggled to move upriver against the strong current.
• They established a camp at an upriver location.
• The pollution originated from factories upriver.