| Disputed: | yes |
| Type: | atoll |
| Investigator Shoal | |
| Other Names: | Terumbu Peninjau (Malay) Pawikan Shoal (Philippine English) Buhanginan ng Pawikan (Filipino) Bãi Thám Hiểm (Vietnamese) 榆亚暗沙 Yúyà ànshā (Chinese) |
| Pushpin Map: | Spratly Islands relief |
| Location: | South China Sea |
| Coordinates: | 8.1142°N 114.7019°W |
| Archipelago: | Spratly Islands |
| Country Admin Divisions Title: | State |
| Country Admin Divisions: | Sabah |
| Country Admin Divisions Title 1: | District |
| Country Admin Divisions 1: | Kudat |
| Country1 Admin Divisions Title: | City |
| Country1 Admin Divisions: | Sansha, Hainan |
| Country2 Admin Divisions Title: | State |
| Country2 Admin Divisions Title 1: | District |
| Country2 Admin Divisions 1: | Kudat |
| Country2 Admin Divisions: | Sabah |
| Country3 Admin Divisions Title: | Municipality |
| Country3 Admin Divisions: | Kalayaan, Palawan |
| Country4 Admin Divisions Title: | Municipality |
| Country4 Admin Divisions: | Cijin, Kaohsiung |
| Country5 Admin Divisions Title: | District |
| Country5 Admin Divisions: | Truong Sa, Khanh Hoa |
Investigator Shoal, also known as ms|'''Terumbu Peninjau'''|lit=; Pawikan Shoal (fil|Buhanginan ng Pawikan|lit=Sandbank of Sea Turtle); vi|bãi Thám Hiểm; chữ Nôm: 探險; Mandarin , is located in the SW of Dangerous Ground in the Spratly Islands of the South China Sea.[1]
It is an atoll above water at low tide; some large rocks at the western end might be visible at high water. The atoll is 32.1km (19.9miles) and is up to 10.6 km wide.[2] The total atoll area is 188sqkm. The lagoon is up to 45 meters deep.[3]
It is one of the areas in the Spratly Islands occupied by Malaysia. The Royal Malaysian Navy has maintained an "offshore naval station" there called "Station Papa" since 1999.[4]