Ollans is a commune in the Doubs department in the Bourgogne-Franche-Comté region in eastern France. Ollans lies 20 km north of Marchau…Ollans is a commune in the Doubs department in the Bourgogne-Franche-Comté region in eastern France. Ollans lies 20 km north of Marchaux on the border of the department of Haute-Saône. It is situated on the Ognon, which forms the border between the two departments.