Nižný Čaj is a village and municipality in Košice-okolie District in the Košice Region of eastern Slovakia.
Nižný (Lower) Čaj and Vyšný (Upper) Čaj come from Slavic personal name Čavoj (ča-: to expect, voj: militia, warrior).
In historical records the village was first mentioned in 1335.
The municipality lies at an altitude 207 metres and covers an area of 2.946 km². It has a population of about 271 people.
Coordinates: 48°40′N 21°24′E / 48.667°N 21.400°E / 48.667; 21.400
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