Indonesia vs Monaco flag: how to tell them apart

Both are red over white, so check the shape: Monaco's flag is 4:5 and Indonesia's is a longer 2:3. Monaco's red is also a slightly darker shade.

Indonesia

Monaco

How to tell them apart

Shape

Monaco's flag is 4:5, almost square. Indonesia's is 2:3, noticeably longer.

Shade of red

Monaco's red is a slightly darker shade than Indonesia's. Indonesia's digital red is #FF0000 and its physical red is #ED1C24.

Same stripes

Both have two equal horizontal bands, red on top and white below, so stripe order will not help you.

Where the colours come from

Monaco's red and white have been heraldic colours of the House of Grimaldi since at least 1339. Indonesia's flag is officially called Sang Saka Merah-Putih, The Heirloom Red-White.

Bert's facts

Indonesia: Indonesia shares land borders with three countries.
Monaco: Monaco's red-and-white flag colours have been associated with its ruling house since 1339.