Saphan Lek is the name of a bridge and a now-extinct makeshift market near the bridge in Bangkok. Now officially known as Damrong Sathit Bridge, the bridge was originally built to carry the Charoen Krung Road across Khlong Ong Ang during 1862–1864. It had a steel structure supporting a wooden floor, with an opening mechanism that allowed boats to pass. The bridge was rebuilt in 1900 under the supervision of Carlo Allegri, and named Damrong Sathit in honour of Prince Damrong Rajanubhab. It was yet again rebuilt with reinforced concrete in the reign of King Prajadhipok, and is now a recognised ancient monument.

Pom Prap Sattru Phai is one of the 50 districts (khet) of Bangkok, Thailand. Neighbouring districts are Dusit, Pathum Wan, Bang Rak, Samphanthawong, and Phra Nakhon. With more than 24,000 inhabitants per square kilometre it is the district with the highest population density in Thailand.