The Queen Emma Bridge is a pontoon bridge across St. Anna Bay in Curaçao. It connects the Punda and Otrobanda quarters of the capital city, Willemstad. The bridge is hinged and opens regularly to enable the passage of oceangoing vessels. On the opposite end from the hinge is a small shelter where an operator controls two diesel engines turning propellers. The propellers are mounted perpendicular to the length of the bridge and allow it to swing parallel to the shore.