Process for the production of urea from ammonia and carbon dioxide in a urea plant, a) wherein the urea plant contains a recovery section and a high-pressure synthesis section comprising two reactor sections, a stripper and a condenser, b) wherein in the first reactor section a first synthesis solution is formed that is fed to the second reactor section; c) fresh carbon dioxide is fed to the second reactor section and in the second reactor section a second synthesis solution is formed that is fed to the stripper, d) wherein the second synthesis solution is stripped with the use of carbon dioxide as stripping gas and the mixed gas stream obtained in the stripper is sent to the condenser together with fresh ammonia and a carbamate stream and is condensed under the removal of heat, e) whereafter the condensate that is formed in the condenser is fed to the first reactor section f) and the urea stream that is obtained in the stripper is further purified in the recovery section, g) characterized in that the flow of the first synthesis solution from the first reactor section to the second reactor section, the flow of the second synthesis solution from the second reactor section to the stripper, the flow of the mixed gas stream from the stripper to the condenser and the flow of the condensate from the condenser to the first reactor section is a gravity flow, h) wherein the first reactor section and the condenser are combined in one vessel, which vessel is placed horizontally, i) wherein in the first reactor section as well as in the second reactor section at least 20 wt% of the total amount of urea in the synthesis section is formed, j) wherein synthesis gas that has not reacted in the second reactor section is removed from the second reactor section. a) wherein the urea plant contains a recovery section and a high-pressure synthesis section comprising two reactor sections, a stripper and a condenser, b) wherein in the first reactor section a first synthesis solution is formed that is fed to the second reactor section; c) fresh carbon dioxide is fed to the second reactor section and in the second reactor section a second synthesis solution is formed that is fed to the stripper, d) wherein the second synthesis solution is stripped with the use of carbon dioxide as stripping gas and the mixed gas stream obtained in the stripper is sent to the condenser together with fresh ammonia and a carbamate stream and is condensed under the removal of heat, e) whereafter the condensate that is formed in the condenser is fed to the first reactor section f) and the urea stream that is obtained in the stripper is further purified in the recovery section, g) characterized in that the flow of the first synthesis solution from the first reactor section to the second reactor section, the flow of the second synthesis solution from the second reactor section to the stripper, the flow of the mixed gas stream from the stripper to the condenser and the flow of the condensate from the condenser to the first reactor section is a gravity flow, h) wherein the first reactor section and the condenser are combined in one vessel, which vessel is placed horizontally, i) wherein in the first reactor section as well as in the second reactor section at least 20 wt% of the total amount of urea in the synthesis section is formed, j) wherein synthesis gas that has not reacted in the second reactor section is removed from the second reactor section.