Marikina is 3.9 times larger than San Juan, Metro Manila.
Area: 23 km2 calculated
Marikina, officially the City of Marikina, located in the island of Luzon in the Philippines, is one of the cities that make up Metro Manila, the National Capital Region. Wikipedia
Area: 6 km2 calculated
San Juan is a city in the Philippines. It is one of the cities that comprises Metro Manila, the National Capital Region of the Philippines. It is the smallest city in the country in terms of land area. Wikipedia