Quarai is a Brazilian municipality located near the border with Uruguay on the Rio Quaraí.

[2] Its elevation is 112 m. It is located 590 km west of the state capital of Porto Alegre, northeast of Montevideo, Uruguay and southeast of Alegrete.

Created in 1971, the flag is made up of three stripes, blue, green and white in normal tones, it features a blue and red triangle-rectangle and a quadrilateral green that ascends between the two triangles with a blue triangle and in the left side of the flag, the angle of the green triangle is low and right.

The center is elliptically vertical, in the white panel, the coat of arms added under law 400 December 21, 1964.

The first inhabitants were South American Indians including the Jarros, Guenoas, Minuanos and the Charruas people.