About 85 km by river from Khulna city is Sheikh’s canal on the eastern bank of Sibsa river. Some distance ahead of him is a canal of ink. The place between these two canals is known as Shekhertek. Scattered throughout the area are the ruins of medieval structures, brick walls and mounds. But now only the Kali Mandir survives as a standing structure. Inside the Sundarbans, Kalimandir stands as a witness to the medieval history of Bengal at Shekertek. Although the temple has been hidden from the public eye for approximately 400 years, now the forest department is going to open it for tourists. The Shekhartek Ecotourism center is built around the temple built during the Mughal period. It is located on the east bank of Shibsa river in compartment No. 16 of Adachai Patrol Outpost of Kalabagi Forest Station in Khulna Range of Western Forest Division of Sundarbans. The forest department is constructing a concrete foot trail of about 150 km from the Shekhartek canal to the temple. The foot trail has been taken around the temple. Besides, a watch tower has been constructed for tourists to see the top of the forest. Brick roads have also been constructed at some places in the forest. A toilet is also available for the convenience of tourists. Recently, the temple was surveyed by the Department of Archaeology. According to their report, the temple is currently in a very dilapidated condition. It is believed to have been built between 300 and 350 years ago based on its architecture and style. It has two entrances on the south and west sides. The temple is built with a domed roof. A total of four types of bricks have been used. The measurements are 20154 cm, 20154.5 cm, 16124 cm and 16125 cm. The exterior of the temple is 655 cm square. And the inner part is 325 cm square. The thickness of the wall is 165 cm. Inside there is a small hut on the north side. Each entrance on the south and west sides is 97 cm wide. The exterior of the temple is decorated with terracotta bricks with geometric designs, flowers-vines-leaves etc. The heavily damaged temple on the south and west sides also has cracks at various places inside. The top of the temple is full of trees and plants. The roots of huge trees have penetrated and severely damaged the dome and walls of the temple. Already the dome and walls have cracks. As a result of these cracks, the dome and the bricks of the south-west and north-east corners of the temple fell off. Fragments of bricks falling from the walls are scattered around the temple. Also there are many small and big trees around the temple especially on the south side, due to their shade the sunlight cannot enter the temple. According to the Department of Antiquities, it is initially believed that lime made from local snails and sand from the Sibsa River were used in the construction of the temple. Samples are collected for chemical testing. The temple bears witness to the fact that the Sundarbans and its surrounding areas were inhabited long ago. The temple is estimated to have been built around 300-350 years ago based on its architecture and art style. If the temple is not preserved, it will soon be destroyed. If the forest department cooperates, the conservation department will take initiative to preserve it. Various history books indicate Shekhartek and Kali temple as the most famous ancient structures of Sundarbans. However, who lived in that place or why the name Shekhertek was given, is not stated correctly in any history book. In the first volume of the history of Jessohar-Khulna written by Satish Chandra Mitra, published in 1914, some information about Sheikh’s tech has been highlighted. It is written in that book, the relatively high altitude dense forest between the Sekher Canal and the Kali Canal is called Sekhertek. There are plenty of beautiful trees, the number of deer is very high and the importation of tigers (tigers) is also high. So we had to travel to this forest with our lives in our hands. After entering the Sekhar canal, on the right side, on the side of the fourth paskhali, the remains of a brick house and some trees can be seen. From there, after going about a mile into the forest, a fort can be seen. Generally, Bawalis call it ‘Bara Bari’. Probably this is the Shiva Fort of Maharaja Pratapaditya. High ramparts are still present in many parts of the fort. There are ruins of a Shiva temple in the north-east or east corner of the fort. If you proceed from there to the south-east face, where there is a pond and then 3 brick houses and numerous settlements are found. The earthen mounds of the houses are covered with hundreds of gorse trees. Going out of it, a beautiful temple comes into sight in a relatively open area. I have never seen such a temple standing in a state of disrepair and full of various crafts in the dense forests of the Sundarbans. The book mentions, “Looking at the other aspects of the temple, it is easy to guess that a Hindu work was built here during the Mughal period.” In another place it is written, “There is no deity in the temple; However, it can be assumed that Pratapaditya built this temple of Goddess Kalika near his fort.” Also, AFM Abdul Jalil’s book titled History of Sundarbans describes the structure. His book states, “The area of the Shekhertek region will average 10 square miles. It is easy to understand that there was once a lot of people living and commuting there. Perhaps to protect the subjects from the tyranny of the Mughal-Portuguese pirates, the Mughal rulers built military bases there and developed beautiful localities. The temple will be built for Hindu royalty. However, he mentions at another place in the book, some people speculate that this place is King Pratapaditya’s Shivsa Fort or a Mughal-built fort. However, according to a report of the Forest Department, the history of the Sundarbans is believed to date back to the Barovian or Mughal period (1600s or contemporary). Among the buildings in this region, the ruined mound is known as Sheikh’s House, but historically it has been called Sibsa Durg.