the.com/brackish
Water that can't decide if it's the ocean or a river.
means Slightly salty water, saltier than fresh but less than the sea, typical of estuaries and marshes.
from From Dutch brak, meaning salty or briny, surfacing in English sailors' vocabulary around the 1500s.
Salt rangeRoughly 0.5 to 30 grams of salt per liter.
Estuary signatureWhere rivers meet seas, brackish water reigns.
Figurative useAlso describes anything distasteful or unpleasant.