WHERE IS this? Your task is to guess in which city this picture was taken. The prize for the first correct answer out of the hat will be a three-night break for two in that very city.

To enter, send your answer, your name, address and telephone number on a postcard to: City Break Competition, PO Box 4021, London E14 5BU. Entries must arrive by Thursday 23 December.

Last week's picture (below) was of San Francisco and the prize-winner, Stewart L Hay from the Shetland Islands, will be whisked there for a week's holiday, visiting the stunning Golden Gate Park, taking a walk down the most crooked street in the world, Lombard Street, and eating and drinking in the famous Fisherman's Wharf. The trip also includes a visit to the wine region of the Napa Valley - all courtesy of Zantac 75 Relief.

Zantac 75 Relief* is an effective and gentle heartburn and indigestion treatment that lasts for up to 12 hours - it keeps going so you can. (*Contains Ranitidine. Always read the label.)

The prize includes seven nights' five-star b&b accommodation for two people, transfers and return flights - and pounds 1,000 spending money.

RULES: 1. The prize includes transport and three nights' b&b accommodation for two people sharing a room. All other meals, drinks, travelling expenses and extras will be charged as taken. 2. The holiday is subject to availability and must be taken by 30 June 2000, excluding some peak periods. 3. The holiday is not transferable and there is no cash alternative. 4. Only one entry per person. The prize draw/competition is open to all residents of the UK aged 18 and over other than the employees (and their families) of Independent Newspapers or subsidiary companies. 5. The competition winner will be picked on Thursday 23 December and the winner will be notified in writing within seven days of the draw. 6. The judge's decision is final and no correspondence will be entered into. No responsibility will be taken for entries lost or damaged in the post. 7. All entries are the sole property of The Independent on Sunday and the winner must be willing to have his or her name published. 8. For details of correct answers and winner, please send a stamped and self-addressed envelope to the Travel Desk at The Independent on Sunday. 9. No purchase is necessary.