A turbine vane for a gas turbine, the turbine vane comprising: - an inner shroud having an upper surface and a lower surface; - a seal unit disposed at the lower surface of the inner shroud and defining a first region and a second region at the lower surface of the inner shroud, wherein the inner shroud comprises a first impingement cavity at the lower surface of the inner shroud at the first region, and a second impingement cavity at the lower surface of the inner shroud at the second region; - a first impingement unit arranged in the first region and comprising a first impingement plate facing the inner shroud defining a first impingement chamber thereinbetween, wherein the first impingement chamber includes the first impingement cavity and wherein the first impingement plate is configured to receive cooling air and form impingement jets directed into the first impingement chamber; - a second impingement unit arranged in the second region and comprising a second impingement plate facing the inner shroud defining a second impingement chamber thereinbetween, wherein the second impingement chamber includes the second impingement cavity; and - at least one connector flow channel configured to direct cooling air from the first impingement chamber to the second region; wherein the second impingement plate is configured to receive cooling air from the connector flow channel and to form impingement jets directed into the second impingement chamber; characterized in that: - wherein the first impingement cavity and the second impingement cavity are separated by an intervening section of the inner shroud, and the connector flow channel extends through the intervening section of the inner shroud; or - wherein the seal unit comprises: a seal support lug extending radially inwards from the lower surface of the inner shroud, and a seal plate supported at and arranged radially inwards from the inner shroud and extending radially inwards from the lower surface of the inner shroud or from the seal support lug, and wherein the connector flow channel extends through at least one of the seal support lug and the seal plate. - an inner shroud having an upper surface and a lower surface; - a seal unit disposed at the lower surface of the inner shroud and defining a first region and a second region at the lower surface of the inner shroud, wherein the inner shroud comprises a first impingement cavity at the lower surface of the inner shroud at the first region, and a second impingement cavity at the lower surface of the inner shroud at the second region; - a first impingement unit arranged in the first region and comprising a first impingement plate facing the inner shroud defining a first impingement chamber thereinbetween, wherein the first impingement chamber includes the first impingement cavity and wherein the first impingement plate is configured to receive cooling air and form impingement jets directed into the first impingement chamber; - a second impingement unit arranged in the second region and comprising a second impingement plate facing the inner shroud defining a second impingement chamber thereinbetween, wherein the second impingement chamber includes the second impingement cavity; and - at least one connector flow channel configured to direct cooling air from the first impingement chamber to the second region; wherein the second impingement plate is configured to receive cooling air from the connector flow channel and to form impingement jets directed into the second impingement chamber; characterized in that: - wherein the first impingement cavity and the second impingement cavity are separated by an intervening section of the inner shroud, and the connector flow channel extends through the intervening section of the inner shroud; or - wherein the seal unit comprises: a seal support lug extending radially inwards from the lower surface of the inner shroud, and a seal plate supported at and arranged radially inwards from the inner shroud and extending radially inwards from the lower surface of the inner shroud or from the seal support lug, and wherein the connector flow channel extends through at least one of the seal support lug and the seal plate. - wherein the first impingement cavity and the second impingement cavity are separated by an intervening section of the inner shroud, and the connector flow channel extends through the intervening section of the inner shroud; or - wherein the seal unit comprises: a seal support lug extending radially inwards from the lower surface of the inner shroud, and a seal plate supported at and arranged radially inwards from the inner shroud and extending radially inwards from the lower surface of the inner shroud or from the seal support lug, and wherein the connector flow channel extends through at least one of the seal support lug and the seal plate.