About 70-80 houses at Gharialdanga union in Rajarhat upazila are under threat as untimely erosion by the Teesta River has taken a serious turn due to rise in water level in the last few days. Six houses have already gone into the gorge of the Teesta River. The Teesta River flows over three upazilas of Kurigram district. Also read: Relentless Garai erosion leaves many homeless in Jhenaidah Water Development Board officials are trying to prevent the erosion in only five kilometers area while about 40 kms of the left bank of the river is under erosion threat, said locals. Erosion is now going on in many places of the remaining 35 kms areas of the river banks, they said.