The Israeli military is quietly but quickly building a giant earthen barrier separating the over 50% of the Gaza Strip it controls from the rest of the territory, according to satellite imagery, further entrenching the division of the tiny Palestinian enclave.

Axar.az reports, citing The Associated Press, that more than 23 kilometers (14 miles) have been constructed in recent months, running through Palestinian communities demolished by the military. That is equivalent to more than half the length of the coastal strip, which is some 40 kilometers (25 miles) long and 11 kilometers (7 miles) wide, and home to over 2 million Palestinians.

When presented with the satellite images, Israel’s military confirmed that it has built a physical barrier in the area of the so-called yellow line, the boundary to which Israeli troops withdrew under the October ceasefire deal with Hamas. The line was envisioned in the U.S.-backed agreement as a temporary division of the territory pending a fuller Israeli withdrawal.