diff --git a/lib/Alchemy/Phrasea/Form/Constraint/Geoname.php b/lib/Alchemy/Phrasea/Form/Constraint/Geoname.php
new file mode 100644
index 0000000000..ace2f3529d
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Form/Constraint/Geoname.php
@@ -0,0 +1,43 @@
+<?php
+
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2013 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Phrasea\Form\Constraint;
+
+use Symfony\Component\Validator\Constraint;
+use Alchemy\Geonames\Connector;
+use Alchemy\Geonames\Exception\TransportException;
+use Alchemy\Geonames\Exception\NotFoundException;
+
+class Geoname extends Constraint
+{
+    private $connector;
+    private $message;
+
+    public function __construct(Connector $connector)
+    {
+        $this->message = _('This place does not seem to exist.');
+        $this->connector = $connector;
+        parent::__construct();
+    }
+
+    public function isValid($geonameid)
+    {
+        try {
+            $this->connector->geoname($geonameid);
+        } catch (TransportException $e) {
+            return true;
+        } catch (NotFoundException $e) {
+            return false;
+        }
+
+        return true;
+    }
+}
diff --git a/lib/Alchemy/Phrasea/Form/Constraint/GeonameValidator.php b/lib/Alchemy/Phrasea/Form/Constraint/GeonameValidator.php
new file mode 100644
index 0000000000..899f0c66fe
--- /dev/null
+++ b/lib/Alchemy/Phrasea/Form/Constraint/GeonameValidator.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2013 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Alchemy\Phrasea\Form\Constraint;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+class GeonameValidator extends ConstraintValidator
+{
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint->isValid($value)) {
+            $this->context->addViolation(_('This place does not seem to exist.'));
+        }
+    }
+}
diff --git a/tests/Alchemy/Tests/Phrasea/Form/Constraint/GeonameTest.php b/tests/Alchemy/Tests/Phrasea/Form/Constraint/GeonameTest.php
new file mode 100644
index 0000000000..c7ec707b9e
--- /dev/null
+++ b/tests/Alchemy/Tests/Phrasea/Form/Constraint/GeonameTest.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Alchemy\Tests\Phrasea\Form\Constraint;
+
+use Alchemy\Phrasea\Form\Constraint\Geoname;
+use Alchemy\Geonames\Geoname as GeonameResult;
+use Alchemy\Geonames\Exception\NotFoundException;
+use Alchemy\Geonames\Exception\TransportException;
+
+class GeonameTest extends \PhraseanetPHPUnitAbstract
+{
+    public function testAValidGeonameIsValid()
+    {
+        $connector = $this->getConnectorMock();
+        $connector->expects($this->once())
+            ->method('geoname')
+            ->with(123456)
+            ->will($this->returnValue(new GeonameResult(array())));
+
+        $constraint = new Geoname($connector);
+        $this->assertTrue($constraint->isValid(123456));
+    }
+
+    public function testATransportErrorIsIgnored()
+    {
+        $connector = $this->getConnectorMock();
+        $connector->expects($this->once())
+            ->method('geoname')
+            ->with(123456)
+            ->will($this->throwException(new TransportException()));
+
+        $constraint = new Geoname($connector);
+        $this->assertTrue($constraint->isValid(123456));
+    }
+
+    public function testAResourceNotFoundReturnFalse()
+    {
+        $connector = $this->getConnectorMock();
+        $connector->expects($this->once())
+            ->method('geoname')
+            ->with(123456)
+            ->will($this->throwException(new NotFoundException()));
+
+        $constraint = new Geoname($connector);
+        $this->assertFalse($constraint->isValid(123456));
+    }
+
+    private function getConnectorMock()
+    {
+        return $this->getMockBuilder('Alchemy\Geonames\Connector')
+            ->disableOriginalConstructor()
+            ->getMock();
+    }
+}
diff --git a/tests/Alchemy/Tests/Phrasea/Form/Constraint/GeonameValidatorTest.php b/tests/Alchemy/Tests/Phrasea/Form/Constraint/GeonameValidatorTest.php
new file mode 100644
index 0000000000..288681bb0b
--- /dev/null
+++ b/tests/Alchemy/Tests/Phrasea/Form/Constraint/GeonameValidatorTest.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace Alchemy\Tests\Phrasea\Form\Constraint;
+
+use Alchemy\Phrasea\Form\Constraint\GeonameValidator;
+
+class GeonameValidatorTest extends \PhraseanetPHPUnitAbstract
+{
+    /**
+     * @dataProvider provideData
+     */
+    public function testValidate($valid)
+    {
+        $context = $this->getMock('Symfony\Component\Validator\ExecutionContextInterface');
+        $builder = $context
+            ->expects($this->exactly($valid ? 0 : 1))
+            ->method('addViolation');
+
+        if (!$valid) {
+            $builder->with($this->isType('string'));
+        }
+
+        $validator = new GeonameValidator();
+        $validator->initialize($context);
+
+        $constraint = $this->getConstraint();
+        $constraint
+            ->expects($this->once())
+            ->method('isValid')
+            ->with(123456)
+            ->will($this->returnValue($valid));
+
+        $validator->validate(123456, $constraint);
+    }
+
+    public function provideData()
+    {
+        return array(
+            array(true),
+            array(false),
+        );
+    }
+
+    private function getConstraint()
+    {
+        return $this
+            ->getMockBuilder('Alchemy\Phrasea\Form\Constraint\Geoname')
+            ->disableOriginalConstructor()
+            ->getMock();
+    }
+}