Kolkata Port (formerly known as Calcutta Port) faces the issue of silt accumulation. The port is located on the Hooghly River, which has a tendency to deposit silt, reducing the navigability of the river and making it difficult for larger ships to access the port. This issue has been a long-standing problem for Kolkata Port, and extensive dredging operations are required to maintain its depth and ensure smooth operations.
Thus, the correct answer is Kolkata port.