Flood situation in Gaibandha and Bogura worsened further following the rise of water level in Brahmaputra, Teesta, Ghaghat and Jamuna rivers.
In Gaibandha, Teesta, Brahmaputra and Ghaghat have been flowing over the danger levels, leaving 20,000 people marooned.
According to the Water Development Board, the Brahmaputra River is flowing 59cm above the danger level while Ghaghat River is flowing 35cm above the danger mark.
About 20,000 residents of Sundarganj, Sadar, Phulchari and Saghata upazilas have been affected.
Roads and educational institutions in many areas were submerged while people have been using boats to cross the Gaibandha-Balashighat road.
Aminul Islam, chairman of Tarapur Union in Sundarganj upazila, said flood waters have entered Tarapur, Belka, Kanchipara, Haripur, Kapasia, Sreepur, Chandipur of Sundarganj upazila, Kamarjani, Molarchar, Gidari areas in Sadar upazila, Erendbari, Fazlupur, Phulchari, Gazaria, Uria, Udkhali areas in Phulcharri upazila, Bharatkhali, Ghuridah and Haldia areas in Saghata upazila.
People in the flood affected areas have taken shelter in the flood protection dam and high places with their domestic animals.
Idris Ali, District Releif and Rehabilitation officer, said 13 unions of four upazilas were affected by the flood water.
In Bogura, The low-lying areas of Sariakandi upazilas have been inundated by the recent flood water caused by the onrush of hill water and heavy rainfall for the last couple of days, damaging the standing crops and vegetable in the area.
Besides, the Jamuna River at Sariakandi point is flowing 35cm above the danger level.
Abdul Halim, Sariakandi Upazila Agriculture Officer, said some 4,076 hectares of jute, aush, vegetable, aman seedbeds, corn and chili fields in Chaluabari, Hatsherpur, Kajla, Kornibari, Chandanbaisha, Bohail of the upazila were inundated.
If the situation does not improve then the under construction flood protection dam, located at Kutubpur union in the upazila, will face a great risk of collapse, he said.
Sariakandi Upazila Nirbahi Officer Russel Mia demanded support from all to tackle the flood situation.