Chak Chakoo is one of the traditional customs of the month of Moharram in the city of Estehbân in the Fârs region. Chak Chakoo is a type of traditional funeral lament that is celebrated in this city in the afternoon of Âshurâ in the presence of the inhabitants. The participants in the rite first prepare two stones or two pieces of wood and in a row or at a distance of one step from each other, they arrange themselves in an arc around the one who recites laments and turn. Reciting sad verses and following the directions of the moaner, the participants, instead of beating their breasts, hold the stones or two pieces of wood in two hands, raise them over their heads and beat them together; then in conjunction with the rhythm of the elegy, they bend and again strike the two stones between their legs. Together they take one step forward and one step back, and repeat the verse or first verse of the elegy. The number of participants gradually increases and the arc gets bigger and bigger until it takes the shape of a circle. Sometimes the circle from the center of the square widens, then like a spiral a second circle is formed.