Manuel Quimper explores the Strait of Juan de Fuca.

Manuel Quimper Benítez del Pino was a Spanish Peruvian explorer, cartographer, naval officer, and colonial official. He participated in charting the Strait of Juan de Fuca and the Sandwich Islands in the late 18th century. He was later appointed a colonial governor in his native Peru at the beginning of the fight for independence there. He retired to Spain, but was able to return to Peru where he served as a naval officer in the new republic and pursued a literary career, publishing over 20 books about his experiences before his death there in Lima.

The Strait of Juan de Fuca is a body of water about 96 miles long that is the Salish Sea's main outlet to the Pacific Ocean. The international boundary between Canada and the United States runs down the centre of the Strait.

May 31 is the 151st day of the year in the Gregorian calendar; 214 days remain until the end of the year.