18 November 2011 Last updated at 09:20 GMT bbc
The circle below shows the gross external, or foreign, debt of some of the main players in the eurozone as well as other big world economies. The arrows show how much money is owed by each country to banks in other nations. The arrows point from the debtor to the creditor and are proportional to the money owed as of the end of June 2011. The colours attributed to countries are a rough guide to how much trouble each economy is in
Source: Bank for International Settlements, IMF, World Bank, UN Population Division
Notes on the data: The Bank for International Settlements data, represented by the proportional arrows, shows what banks in one country are owed by debtors - both government and private - in another country. It does not include non-bank debts. Only key eurozone debtors and their top creditors are shown. Although China is known to hold European debt, no comprehensive figures are available.
GDP figures are the latest complete 2010 figures from the IMF. The percentage of gross government debt to GDP is also the latest IMF calculation.
Overall gross external (or foreign) debt is taken from the latest 2011 World Bank/IMF figures and includes all debt owed overseas, including that owed by governments, monetary authorities, banks and companies. Gross external debt per head of population is calculated using the latest medium variant population figures from the UN Population Division.