Foreign Exchange reserves by nation( March 2021) (excludes gold)

China $3707 Billion

Japan $1319 Billion

Switzerland $995Billion

India $543 Billion

Taiwan $539 Billion

Saudi Arabia $449 Billion

Russia $448 Billion

South Korea $440 Billion

Singapore $382Billion

Brazil $344 Billion

Thailand $237 billion 

Mexico $193 billion

Israel $186 Billion

Czech Republic $163 Billion

United Kingdom $154 Billion

Poland $146 Billion

(regarding U.S. foreign reserves)

Most of their reserves are held in the U.S. dollar. ... U.S. foreign exchange reserves totaled $129 billion, as of January 2020, compared to China's $3.1 trillion. Russia's foreign exchange reserves are held mostly in U.S. dollars, much like the rest of the world, but the country also keeps some of its reserves in gold.

Why Countries Hold Foreign Exchange Reserves - Investopedia