Kolkata: The West Bengal government has urged the central government to take up with the Nepal government the issue of "barriers in elephant-migration route" so that the jumbos can move unhindered along the India-Nepal border. "The migratory pattern there was from east to west... along our border with Nepal, the elephants would cross over, spend two months in Nepal and then come back. Since last year on the Nepal side, they have put up 18-km-long electric fence which is preventing the elephants from going there," Chandan Sinha, principal secretary, forest department, West Bengal, told media here. "This is creating problems on our side. We have taken up the issue with the government of India and we hope something will be done. We have requested them to take it up with the Nepal government," Sinha added.